There are only two (AFAIK) .22 pistols that use the toggle link action, except the Luger conversion kit

I have one of those kits (post war) and it is far from reliable. It seems to always "short chamber" the round, whereby some pressure on the toggle is required to fully seat the round, almost as if it is forcing the bullet into the rifling.

I have considered (but have yet to act on) getting a chambering reamer and lengthening the chamber by one or two thousandths to see if it makes a difference. Any thoughts?